Martinez-Ferrer, M.T., García-Marí, F., & Ripollés Molés, J.L. 2003a Host and parasitoid densities influence on progeny and sex ratio of Anagyrus pseudococci (Girault) and Leptomastix dactylopii Howard Hymenoptera: Encyrtidae); two Planococcus citri (Risso) (Homoptera: Pseudococcidae) parasitoids.. Bulletin OILB/SROP (Sect. Reg. Ouest Palearctique) 26(6): 139-147.

Notes: The effects of different P. citri, A. pseudococci and L. dactylopii densities on progeny, parasitization and sex ratio were investigated under controlled laboratory conditions. L. dactylopii progeny numbers increased significantly as did host density until the host:parasitoid ratio was 80:1. Thereafter, the progeny numbers began to decline. The numbers of A. pseudococci progeny slightly increased as the host density increased. Parasitism percentages for the two parasitoids decreased as the host density increased. A. pseudococci and L. dactylopii attained optimum levels for mass production when the host: parasitoid ratios were 10:1 and 80:1, respectively. The numbers of A. pseudococci progeny increased with increasing parasitoid densities (2, 4, 6, 8 and 10 females) when the host density was held stable (480 P. citri0). L. dactylopii only showed this trend at the lower parasitoid densities. The number of A. pseudococci progeny per female was not affected by parasitoid density, although the number of L. dactylopii progeny per female decreased as the parasitoid density increased. The sex ratios of A. pseudococci and L. dactylopii were unaffected by the modifications to parasitoid densities.